Foot warmer



FIG. 1 is a perspective view of a foot warmer, showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken line showing of the foot warmer is for the purpose of illustrating article and forms no part of the claimed design. 

CLAIM The ornamental design for a foot warmer, as shown and described. 